23131500 has 96 divisors (see below), whose sum is σ = 77016576. Its totient is φ = 5284800.

The previous prime is 23131483. The next prime is 23131513. The reversal of 23131500 is 513132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 23131500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9399 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (802256).

Almost surely, 2^23131500 is an apocalyptic number.

23131500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23131500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38508288).

23131500 is an abundant number, since it is smaller than the sum of its proper divisors (53885076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23131500 is a wasteful number, since it uses less digits than its factorization.

23131500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 23131500 is about 4809.5218057516. The cubic root of 23131500 is about 284.9276516880.

Adding to 23131500 its reverse (513132), we get a palindrome (23644632).

The spelling of 23131500 in words is "twenty-three million, one hundred thirty-one thousand, five hundred".